JPS6032733B2 - Air injection loom auxiliary nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an auxiliary nozzle for an air-injection type loom, which stabilizes the direction of injected air.

When setting the auxiliary nozzle, in preparation for harvesting, the auxiliary nozzle passes through the warp threads and enters the warp closure opening.
A tip 3 is fixed to the tip of the pipe 2 by brazing or press fitting.

The outer diameter of the pipe 2 is such that it does not force strain on the total threads when entering the warp row (usually about the third side).
In addition, it is preferable to make the inner nozzle size as large as possible in order to suppress the pressure loss of the injected air as much as possible, but the strength of the auxiliary nozzle must also be taken into account.
Something about the size of a sail (0.5 skin thick) was used. Such a pipe 2 has a nozzle hole 1 (usually ■0.5 ribs ~ CI.
5 willows). Then, one or more such auxiliary nozzles are arranged on the side of the overall yarn flying path (punch path), and the jetting direction line No. is directed to a predetermined point. By intermittently supplying air at a rate of several hundred times per minute, the twill yarn is conveyed by the air jetted from the nozzle hole 1 each time. In this case, the orientation of the jetting direction line No and the diffusion angle of the jetted air, that is, the directivity of the jetted air toward a predetermined point, have a great influence on the weft conveyance performance. Therefore, the quality of the directivity is determined by the ratio (1/d) between the nozzle length 1 of the nozzle hole 1 and the nozzle hole diameter d, and the variation thereof also depends on the drilling accuracy of the nozzle hole 1. In the case of an auxiliary nozzle of a loom, in other words, when the short-period intermittent airflow as described above suddenly changes direction, transient disturbances in the streamlines occur, it provides good directivity to the jetted air. In order to do the above 1/
It is desirable to set d to 1.9 degrees or more.

However, with conventional auxiliary nozzles, the nozzle hole 1 is bored in the pipe 2, so the nozzle length 1 is limited by the wall thickness of the pipe, and it is also difficult to ensure the precision of drilling into thin pipe walls, so it is difficult to achieve good directivity. However, it was difficult to obtain an auxiliary nozzle with high reproducibility. The present invention has been made in view of the above-mentioned circumstances, and has the purpose of improving the directivity of the jet air in the auxiliary nozzle and reducing its dispersion by adding flesh to the open part of the nozzle hole and reducing the nozzle length. As the number of holes increases, the drilling accuracy is inevitably ensured.

Embodiments of the present invention will be described below with reference to the drawings, and the same reference numerals will be used to denote components that perform the same functions as the follower device. A first embodiment of the present invention will be explained with reference to FIGS. 4, 5, and 6.

Reference numeral 2 denotes an auxiliary nozzle pipe which receives pressurized air from a pressurized air source, and has a tip 5 fixed to its tip.

The tip 5 has a bullet-shaped tip, a base 6 of a thickness that can fit against the pipe 2, the base 6 competes with the tip of the pipe 2, and is fixed by brazing or other means as necessary.
A semicircular portion 7 having a substantially semicircular cross section is cut out in the base portion 6, and a nozzle hole 1 is provided passing through the pipe 2 and the semicircular portion 7. The above-mentioned success/deficiency part is pipe 2
A flow path 8 for pressurized air is formed through the inner gap of the nozzle hole 1, and the cross-sectional area of the flow path 8 is set to be equal to or larger than the cross-sectional area of the nozzle hole 1. In this case,
The length of the straight part 4 of the nozzle hole 1 is the sum of the thickness of the pipe 2 and the thickness of the half-moon part 7, and the nozzle length L can be made long, so that the directivity of the jetted air is improved.

Next, the second embodiment will be explained with reference to FIGS. 7, 8, and 9.
Description of the same parts as in the first embodiment will be omitted. The base 6 of the distal tip 9 has a hole 10 that serves as a flow path 8 for pressurized air, and air is communicated through the hole 10 to connect the pipe 2 and the distal tip 9.
A nozzle hole 1 having a length L of the straight portion 4 is provided through the base 6 of the straight portion 4 .

The cross-sectional area of the hole 10 is set to be at least equal to or larger than the cross-sectional area of the nozzle hole 1. Also, the 10th,
Figures 11 and 12 show a third embodiment.

The distal tip 11 has a hole 12 formed from the base 6 to the head 13, which becomes the flow path 8 for pressurized air.
A nozzle hole 1 having a length L of a straight portion 4 following the nozzle hole 2 is provided.

The hole 12 is provided eccentrically on the tip 11 in order to make the straight length of the injection port as long as possible, and its cross-sectional area is set to be at least equal to or larger than the cross-sectional area of the injection port 1. Since the auxiliary nozzle of this embodiment has the nozzle hole 1 bored in the head 13 of the tip 11, the auxiliary nozzle can be configured simply by fixing the tip 11 to the tip of the pipe 2. Unlike the first and second embodiments, it is not necessary to drill the nozzle hole 1 in the pipe 2, which is advantageous in manufacturing.

In each of the above embodiments, a circular pipe was used and the nozzle hole was also circular. However, an irregularly shaped pipe (elliptical, square, etc.) may be used, and the shape of the nozzle hole may also be oval, rectangular, etc. The number of is not limited to one. As explained above,
According to the present invention, the nozzle length of the nozzle hole can be made longer by the length of the hole drilled in the tip compared to the conventional nozzle hole, which corresponds to the thickness of the pipe, so the directivity of the injected air is improved. In addition, since the nozzle hole is drilled in a thick wall part, the machining accuracy can be easily improved and an auxiliary nozzle with less variation can be provided, so the striping performance of the loom can be improved, and the pressurized air Therefore, the running cost of the loom can be reduced.

[Brief explanation of the drawing]

Figures 1 to 3 show a conventional example, where Figure 1 is a front view, Figure 2 is a sectional view taken along line 0-Ro in Figure 1, and Figure 3 is a cross-sectional view taken along line m-m in Figure 1. 4 to 6 show the first embodiment, FIG. 4 is a front view, FIG. 5 is a sectional view taken along the line V-V in FIG. 4, and FIG. 7 to 9 show the second embodiment. FIG. 7 is a front view, and FIG. 8 is a sectional view taken along a skin line on the side of FIG. 9 is a sectional view taken along the line K-X in FIG. 7, FIGS. 10 to 12 show the third embodiment, FIG. 10 is a front view, and FIG. 11 is a sectional view taken along line K-X in FIG.
12 is a sectional view along the Kitsune-Ichiyanagi line in FIG. 10. 1... Nozzle hole, 2... Pipe, 3, 5, 9, 11...
Tip tip, 4... Straight portion, 8... Channel. Part-Figure 2 figures 3 figures 4 figures 5 figures 6 figures 7 figures 8 figures 9 figures*10 figures 2 figures

Claims (1)

[Claims] 1. In the weft inserting device of an air-injection loom, in which the weft is inserted by conveying the weft by the air ejected from an auxiliary nozzle placed on the side of the shed, at least one side is attached to the tip of the auxiliary nozzle. 1. An auxiliary nozzle for an air-injection type loom, characterized in that a flow path is formed toward one side, and a nozzle hole is bored from this flow path toward the other side.